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621.
In this paper we analyse Stegdetect, one of the well-known image steganalysis tools, to study its false positive rate. In doing so, we process more than 40,000 images randomly downloaded from the Internet using Google images, together with 25,000 images from the ASIRRA (Animal Species Image Recognition for Restricting Access) public corpus. The aim of this study is to help digital forensic analysts, aiming to study a large number of image files during an investigation, to better understand the capabilities and the limitations of steganalysis tools like Stegdetect. The results obtained show that the rate of false positives generated by Stegdetect depends highly on the chosen sensitivity value, and it is generally quite high. This should support the forensic expert to have better interpretation in their results, and taking the false positive rates into consideration. Additionally, we have provided a detailed statistical analysis for the obtained results to study the difference in detection between selected groups, close groups and different groups of images. This method can be applied to any steganalysis tool, which gives the analyst a better understanding of the detection results, especially when he has no prior information about the false positive rate of the tool. 相似文献
622.
623.
Abstract THIS STUDY is about second‐year students’ self‐assessment in law. Its aims were to test how closely the assessment by the students of their own work matched that of their tutor, to give the students an insight into the “marking process” (which research has shown improves learning), to help the students excel in their examination, to find out whether the male students did better than the female students in their assignment and subsequent examination, and to see how far staff time could be saved. The following were found: there was a high level of agreement between the students’ own marks and those of the tutor, there was generally no significant over‐estimation of assignment marks by the students, the participants did better than the non‐participants in the subsequent examination, the female students did much better than the male students in the assignments as well as the examination (although the participants in general did not do better in their examination than they did in their assignment) and considerable staff time was saved. The findings are discussed in the light of previous research. 相似文献